问题
选择题
----It’s traditional in China to firecrackers on Spring Festival.
----But the serious smog（雾霾）nowadays needs us to stop it.
A．give out
B．set off
C．put off
D．show off
答案
B
题目分析：句意：春节放鞭炮是中国传统。但现在严重的雾霾需要我们阻止它。give out分发，赠送； set off 出发; （使）开始; 引起; 点燃; put off推迟；show off使突出; 炫耀，卖弄。所以选B。